Tapping and threading machine.



H. E. HARRlS. TAPPING AND THREADING MACHINE.

APPLICATION FILED AUG.19,19I6.

Patented Jan. 15, 1918.

main,

BARR E. Han ers, or reinsurance CONNEC'IICUT.

TAPPING AND THREADING MACHINE.

Specification of Letters Patent.

Patented Jam 155, i911 Applioationfiled August 19, 1916, a Serial No, 115,809.

To allavhom it may concern:

Be it known that I, Hana ErHannis a citizen the United States residing at Bridgeport, in the county of Fair-field and State of Connecticut, haveinvented certain new and useful Improyeinents in 'lapping and Threading hlachines, of which the fol lowing is a specification.

The invention makes improvements in this class of machines with a view to increasing their facility, accuracy, range, and speed of operation.

()ne object of the inventionis to arrange the partsso that the spindle carrying a tap, die or other tool for operation on work is rotated automatically in one direction upon the pressing of the work againstthe tool, and so that the spindleis rotated automatically in the reverse direction to cause the work to runoif the tool after the desired action of the tool is completed For the purpose of imparting rotary movement to the too1-spindle,a double cone clutch member is fast on t he spindle between, two pulleys, or other driving elements constituting clutch members mounted independently of the spindle and arranged to have the cone clutch member brought to contact therewith, and it is another objeet of the invention Soto form the parts as to prevent oil or other injurious matter from reaching the friction. covering interposed be tween the cooperating clutch-faces.

It isa fUI'lZhQIKObjGChOIE the invention to provide awork-holder of such form that the work may be pressed againsta tool carried by the spindle by pressure of :the operators chest against the work-holder, leaving his hands free to handle the work, and to proride improved in cans whereby such a longit1idinally-movableholder inayfbe restrained from rotary movement Without imposing undue frictional, resistance to its longitudinal movement.

Moreover, improved adjustable means are provided whereby the movement of the holder and theiwork carried thereby toward the tool is limited and stopped exactly at the desired place, "so; that the i work maybe tapped or otherwise operated upon precisely to the predetermined depth or length, this being avaluable feature particularly in tapping work tola bottom in a hole that does not go entirely through a piece andalso in threading with dies upto, a shoulder on the workf i Then read in connection withthe description herein, the details. of construction and arrangement. of parts contemplated by the im'entionwill be apparent 1rom the accompanying drawing, forming part hereof, wherein anembodiment of theyinvention, as adapted to tapping threa ding; andjperforming other work on pieces of material tha t can be moved to and from working position by hand, is disclosed, for purposes oi illustra; U011.

Vhile the disclosures herein now are considered to. exemplify a preferable embodia portion of thework-holder;' and Fig. 3 is a vertical sectional view through the spindle and a portion of its bed.

Having more particular reference to the drawing 1 designates a base or pedestal foruiinggthe supportcf the machine, and to its top is secured by suitable fastenings 5 a beds: "A pan 7, to catch matter removed from the material acted on by the machine and to catch oil, surroi' nds the bed at or near the top of the baseor pedestal.

A spindle-mount is secured at or near one end the bed 6 by suitable liastenings S. and this mountpincliulcs upright standards 9 oppositely disposed in a line longitiulinal of the bed Each of the standardscarries at or near its upper end a journal-box 10. The boxes are. aliu'ed, each projects from its standard toward the other, and it has at its free end an annular shoulder 11 and an enlarged recess I 19 surrounded by the shoul der.

A tool-spindle 13 is jeurnaled and axially movable int'he boxes, and at each end it projeets beyond a' standard 9. The spindle has thereon a clutch-spider or other suitable clutch member thatincludes a hub lt accommodatedby the recesses 12 of the boxes and heldngainst rotary and axialmovement with respect to the spindle by a key 15 and setscrews 16. gp okes 1'7 radiate from the hub to a central ring 18. A rim 19 projects from member.

each side of the ring, and the outer annular faces of the rim incline outwardly toward the axis in opposite directlons. The r m is formed with circumferential grooves 20 in.

its outer face, and its outeredges are turned outwardly in a radial direction as annular flanges 21. The outer grooved faces of the rim are covered with leather or suitable comparatively soft friction material 22, which is retained against creeping in an axial direction by adherence to the rim and by the ring 18 and the flanges21'. The grooved and covered rim affords clutch-faces that have a cushioning and easy grip with coacting clutch-faces hereinafter described. I The clutch-faces being on the outside of the rim, there is no liability of oil reaching the covering thereof either under the influence of gravity or centrifugal action, and, moreover, the flanges 21 also prevent access of oil to the covering. Thus the frictional characteristics of the covering are not injured by oil. The spindle 13 is made as small as is consistent with the strength required for the uses to which the machine is put, and the clutch member is formed of aluminum or other comparatively light material, so that it is easy to overcome the inertia of the mass in starting, stopping, and reversing the direction of rotation of the spindle.

A clutch member, herein designated as an outside clutch member to distinguish it from the one already described, is positioned on each side of the latter clutch member, which for purposes of distinction is designated as the intermediate clutch member. Each outside clutch member has a hub 23 journaled on the outside of the projecting portion of one of the boxes 10 between the shoulder 11. thereof and a standard 9, the shoulder and standard preventing axial movement of the member. Each member has spokes 24 radiating from its hub to a rim 25, which overlaps one of the clutch-faces of the intermediate clutch member and has on the inside a clutchface 26 inclinedparallel or approximately parallel to that of the intermediate clutch The two outside clutch members are mounted coaxially of the tool-spindle and of the intermediate clutch member carried thereby, and they are rotated, when the machine is in operation, in opposite directions by any suitable means, as by belts (not shown) on the outer peripheries of the rim 25 between guard-flanges 27 thereof. The relative arrangement of the parts is such that, when the intermediate clutch member is in the median position between the outside clutch members, its clutch-faces are out of engagement with either of the outside members, and the tool-spindle is at rest. When the spindle is moved axially in one direction, one of the clutch-faces of its clutch member contacts with theclutchia'ce of oneof the outside clutch members, and the spindle is driven in one direction; and, when the spindle is moved axially in the opposite di rection, the contacting clutch-faces will become disengaged, and, the spindle passing the median position, the other pair of clutchfaces will become engaged and the spindle will be rotated in the reverse direction. The ring 18 of the intermediate clutch member extends outwardly between the edges of the rims 25 of the outside clutch members. Below the ring there is a brake-shoe 28, carried by an arm 29 extending through the side of the bed 6 and upwardly through the top of the bed. The arm29 is pivoted on a bracket 30 on the side of the bed, and its outer portion constitutes a handle 31. The weight of the 'shoe' and the portion of the arm on that side of the'pivot is sufilcient to keep the shoe normally out of contact with the ring. However, if at any time it is desired to arrest rotation of the tool-spindle in the median position between the outside clutch members, that may be done by press ing the shoe against 'thering, but under ordinary conditions of use it is not necessary to employ the hand-brake.

The tool spindle has onone of its projecting ends a chuck or other suitable holder arranged to hold taps, dies, or other tools, and the chuck is opposed to a workholder. A work-holder mount '33 is'carried by and longitudinally adjustable on the bed (3, and it is held in adjusted position thereon by suitable fastenings 34; The mount 33 includes upright standards 35 oppositely disposed in a line longitudinal of the bed, and alined guideways 36 at or near the tops of the standards carry a longitudinallymovable work-holder shaft 37 in alinement with the tool-spindle; The shaft at its end opposite to the chuck 32 has any suitable means, such as a socket38, for retaining a work-holder for material being worked by the tool held in the chuck; and on its other end the shaft is formed witha breast plate or' pad 39, arranged to be pressed against by the body of the operator to move the holder and material held thereby toward the tool in the chuck."

Inv order to keep the work-holder shaft and work held thereby from turning while the work is being acted upon by a tool in the chuck, the shaft is enveloped between the standards by asplit collar 4L0 clamped in place by a screw 41 in projecting ears 42, a key 43 being splined into the.- shaft and collar as insurance against relative rotary movement of the parts, and an arm 44 depends from the collar and has on its lower end an anti-friction roller 15 movable in a guideway 46 fixed to the amount 33. The guideway prevents swinging movement of the arm and thereby rotary movement of the shaft. This arrangement, including the anti-friction roller, offers comparatively lit- [the collar -10, and it carries a'stop-screw 48 tile resista'nce'tothe advancement and retraction of the work-holder shaft, even when the turning tendency.is great. Therefore, no

such frictional resistance occurs as will keep the work from lead ng uniformly onto" the tool.

A projection e7 extends laterally from shaft, the screwbeing locked in positions of "adjustment by a loclr-nnt49. The standard adjacent'to the Work end of the workholder shaft has .a' projection 50 extending therefromopposite to an end of the'stopscrew 48. On contact of the end of the screw with this projection, the movement of the work carried by the shaft toward the {i001 in the chuck is stoppedexactly at the jiiirec'letermined place; The collar 40 is ad- 'justed to the approximate position required to stop movement'of the work toward the tool by movement longitudinally of the shaft upon -loosening the clamping-screw t1 and, upon again tightening this screw,

' fine adjustment to'the'fiexact point of stopping demanded for the work turning the stop-screw 48.

is made by In the operation ofthe machine, material to be woi'ked is put in a. work-holder on'the end of the work-holder shaft opposite to the chuck, the operator bears his chest or other part of his body against the breast plate 'or pad 39, and he tlierebyadfvances the work upaigainst the tap, die, or other tool held in thechuck. The pressure of the work against T thetool'moves the toolspindle axially until a clutch-face of the intermediate clutch member engagesthe clutch-face 26 of the clutch"member farther away from the chuck,

this latter clutch member being-driven in the direction,i'equired for operation of the which further advance prevented. The tool having-a tendency to follow or draw into'thc work, theresult is that the clutclr faces that have been engaged become disengaged and the operator by means of, a hand on the work pulls it toward himself and thereby causes engagement of the other pair of clntclrfaces, whereupon reverse rotation is given the tool and the work backed off therefrom. As soon as the tool is backed ed the work, the operator removes the work with his left hand and with his right hand replaces it with a new piece and repeats the working operation. If the tool happens to be continuing to rotate in the reverse direction at a time a new piece of material is brought thercagainst, that is immaterial, for pressure of the material against the tool will cause the axial movement of the toolspindle necessary for disengagement of the then engaging clutch-facesaind the engage- 'the material and the pull of the operator "on thework at the end of the operation of the tool on the material, as just described, are sufficient to disengage the clutch-faces driving the tool in the working direction. However, for use in case the parts may be come hung for any reason, I provide posi tive means for disengaging those faces. This means includes a. footpedal 51 pivoted to the lower portion of the base or pedestal l and connected by a link 52 with a lever 53, which lever is connected by a link 54 to one end of an intermediately pivoted lever 55 having its other end forked and carrying trunnions 56 of a'co'llar 57 loose in a grooved sleeve 58 fast on the end of the tool-spindle opposite to the chuck. It will be seen that, by pressing downwardly on the foot-pedal, the tool-spindle, through the instrimientalities just described, will be moved axiallyin a direction to release the clutch-faces driving the spindle in the working direction. A spring 59 associated with the clutch-releasing means, as by connection at one end to the bed- 6 and at the other end to the lever 53, is so 'tensioned that it has a tendency to maintain the intermediate clutch member normally in a median posiin a state of rest.

Having thus" described my invention, what I claim as new, and desire to secure by Letters Patent is,

1. In a machineof the class described, two

w'cooperable clutch members, one of which has an inclined face for engagementywith the other member formed with grooves and covered with c'omparatively soft friction ma In a machine of the class described, two

co'tiperable clutch members, one of which has an inclined clutch-face for-"engagement with the other member, an outtui'ned annular cooperable clutch members, one of which comprises a ring, a rim having at one side of said ring an inclined clutch-face for engagement with the other member, an outturned annular flange at the edge of said rim, and a covering of friction material on said clutch-face between said flange and said ring.

4:. In a machine of the class described, the combination of a rotatable spindle susceptive of axial movement, a clutch member fast on said spindle and having a ring and an inclined clutch-face extending laterally from the ring, a drive clutch member rotatably mounted independently ofsaid spindle and having a clutch-face cooper-able withf thati of said other clutch member, and a brakeshoe movable to contact with said rlng.

- I In a machine of the class descrlbed, the

. combination of suitably supported alined bearing-boxes, a spindle journaled in and having end portions extending beyond said boxes and susceptive of axial movement. therein, a lever in engagement with said" live of being driven in opposite directions,

a clutch member fast on said spindle between said other clutch members and cooperable Wltll'tllbhfil' of them upon axial move ment of said spindle, and a spring associated with said lever whereby said spindle clutch member normally is maintained in approximately the median position between said other clutch members.

6. In a machine of the class described, the combination of suitably supported alined bearing-boxes, a tool-spindle j ournaled in and wvhereby said lever, is swung, t'Wo clutch members rotatably mounted independently of said spindle and susceptible of being driven in opposite directions, a clutch member fast on said spindle between said other clutch members and cooperable with either of them upon axial movement of said spindle, and spring associated with said lever whereby said spindle clutch member normally-is maintained in the median position between said other clutch members.

7. In a machine of the class described,lthe

combination of a-rotatably-mounted tool-spin dle susceptible of axialmovement under the.

influence of work, two clutch members rotav tably mounted independently of said spindle and susceptible of being driven in opposite Copies of this patent may be obtained tor ,directions,ahclutch member fast- .on said spindle between said other clutch members and cooperable with either of them upon axial movement of said spindle, a tool-holder at one. endof said spindle, a work-holder mount including upright standards having alined guideways, a work-holder shaft longitudinallymovable in said guideways in alinement with said toolspindle, a collar longitudinally movable onsaid sha'ftflneans whereby said collar is held fixed to said shaft, anarm'extending from said collar, a guideway in which the free end of. said arm is movable, an adjustable stop-screw on said collar, and a pro ection on one of said standards and contactable by said stop-screw whereby movement of said shaft towardsaid tool-holder is limited.

8. In a machine ofthe class described, a work-holder mount including upright standards having alined guideways, a work holder shaft longitudinally movable in said guideways, a collar longitudinally movable on said shaft, means whereby said collar is heldin fixed position on said shaft, an arm extendingfromsaid-collar, a guideway; in which the free end of said arm is movable, an adjustable stop-screw on said collar, and aprojection on oneof said standards and contactable by said stop-screw whereby movement of said shaft in one direction is limited. 7 t p 9. In a machine of the class described, a work-holder mount including upright stand- "ards having alined guideways, a work-holder shaft longitudinally movable in said guideways, a collar longitudinally movable on said shaft, means whereby said collar is held in'fixed position on said shaft, an arm extending from said collar, an" anti-friction member on the free end of said arm, a guideway in which said member traverses, an adjustable stop-screw on said "collar, and a projection on one of said standards and contactable by said stop-screw whereby'movement of said shaft inone direction is limited. In witness whereof, I afiix mysignature.

HARRY E. HARRIS.

five cents each, by addressing the Commissioner of Patents, Washington. 13.0. 

